Epidemiologic surveillance is the ongoing, systematic collection, analysis and interpretation of health data. Health data are used to
detect outbreaks, target public health prevention programs and set priorities in disease research and medical training. Accurate disease
reporting is fundamental to surveillance and data interpretation.

The picture shown on the right is the Broad Street Pump in London. This pump was found to be the cause of a cholera outbreak in 1854 by
Dr. John Snow who was a pioneer English epidemiologist. The picture is a link to another website where you can read the story that is
significant in epidemiology history .